completed exercise 3.1

parts/3/phonebookBackend/index.js

@@ -0,0 +1,35 @@
+const express = require("express");
+const app = express();
+
+app.use(express.json());
+
+const PORT = 3001;
+
+app.get("/api/persons", (request, response) => {
+  response.json([
+    {
+      id: "1",
+      name: "Arto Hellas",
+      number: "040-123456",
+    },
+    {
+      id: "2",
+      name: "Ada Lovelace",
+      number: "39-44-5323523",
+    },
+    {
+      id: "3",
+      name: "Dan Abramov",
+      number: "12-43-234345",
+    },
+    {
+      id: "4",
+      name: "Mary Poppendieck",
+      number: "39-23-6423122",
+    },
+  ]);
+});
+
+app.listen(PORT, () => {
+  console.log(`Server running on port ${PORT}`);
+});